Stitch-setting-up device for sewing-machines



(No Model.)

W. s. COBB. STITGH'SBTTING UP DEVICE FOR SEWING MACHINES. No. 421,095. Patented Feb. 11,1890.

azda 6 5 Z,

, with, my improvements set up or marked,

YVINFIELD S. COBB, OF HOLBROOK, ASSIGN OR TO JOHN WV. FORREST, OF

EVERETT, MASSACHUSETTS.

STITCH-SETTING-UP DEVICE FOR SEWING-MACHINES.

SPECIFIGATIQN forming part of Letters Patent No. 421,095, dated February 11, 1890.

Application filed May 28, 1889. Serial No. 312,421.

To aZZ wh0m it may concern: 7

Be it known that I, WINFIELD S. COBB, of Holbrook, county of Norfolk, State of Massachusetts, have invented an Improvement in Sewing-Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention has for its object the comb nation, with a needle and awl to make a stitch, of a simple setting-up device to enter the stock just behind a stitch already made and set it up, as it is called, this setting up taking place while the awl is in the stock and making a hole for a succeeding stitch.

Figure 1, in front elevation, represents a well-known form of leather-stitching machine added. Fig. 2 is an two pieces of leather as having its stitch as it is called. Fig. 3is an enlarged detail of the awl with my improved setting-up device added and a part of the presser-foot bar. Fig. 4 is a section in the line at, Fig. 3; and Fig. 5 is a sectional detail in the line m, Fig. 3.

The frame-work A,the rock-shaft A',the arm A to actuate the awl-bar, the presserbar B, the presser-foot B, the throat-plate B the rock-shaft C, the arm 0, the link 0 the needle-bar C the cast-off bar 0, the rocking frame C in which the needle and cast-off bars reciprocate, and the needle 7t and cast-oft 'n' and thread-guide a are and may be all as usual in wax-thread or leather-stitching machines now in the market and well known. The awl-bar a, carrying the awl a, differs from the usual awl-bar in that it is grooved longitudinally at one side for the reception of a set-up bar b, to the lower end of which is attached by a suitable screw or device 2 the setting-up point Z), the said bar and point constituting a setting-u p device. The presserfoot bar B has attached to it by a screw f a block f which is forked next to and embraces the awl-bar, as shown in Figs. 1, 3, and 4, to act as a guide for the presser-foot bar and to keep the pressenfoot in proper place. The upper endof the setting-up bar Z) carries, as shown, a felt or leather washer 3 and a collar or other suitable projection 4, the said collar,

enlarged detail showing united by stitches and (No model.)

if made, as I prefer, as a separate piece, be: ing held in place by a set-screw 5. The collar or projection 4. and washer 3 surround the awl-bar more or less just above the shoulder 6 thereof, and on the reduced upper and threaded end of the awl-bar is placed a spiral spring h, which rests at its lower end on the collar 4:, the upper end of the spring being acted upon by an adjustable nut h under preferably the control of a locking-nut W.

In practice the awl at each descent makes a hole in the stock for the needle at its next ascent, and while the awl descends to enter the stock the needle-bar and needle descend, as in Figs. 1 and 2, and as the awl penetrates the stock .9 the chisel-pointed end of the point device I) of the setting-up device enters the manner by the arm A acting on the usual stud A of the awl-bar, the spiral spring h, the strength of which has been adjusted according to the hardness and thickness of the stock by'the nut h, is made to act on the collar 4 and force down the bar Z) until the device b enters the leather between two previous stitches, the spring h permitting the device I) to stop in its descent sooner or later, according to the thickness of the stock, while the awl-bar continues to descend. As the awl-bar is raised the shoulder 6 meets the washer 3 and,acting againstthe collar 4, lifts the rod 1) up from the stock. The descent of the bar b is arrested by the contact of the washer or the collar 4 with the block f, attached to the presser-foot bar, the position of the said block being higher or lower, according to the thickness of the stock under the presser-foot.

I do not claim a marker or stitch-settingup device rigidly attached to a presser-foot. If the stock were of uniform thickness, the descent of the collar 4 might be arrested by the top of the head of the machine in which the awl-bar reciprocates, or by a block, such as f, resting on the said head; but where the stock varies in thickness the block f should rise and fall. The bar 1), near its upper end, is ofifset, as at 20, to carry it outside the awlbar groove, in which it slides.

I claim- 1. The combination, with the stitch-formin g mechanism and an awl-bar and awl carried by it to puncture the stock for the passage of the needle, of a bar I), yieldingly mounted on the awl-bar to provide for stock of diiterent thickness, and a stitch-setting-np device attached to the said bar I) and moved with it, as described, and for the purposes set forth.

2. The presser-foot, the presser-foot bar, a block f thereon, stitch-forming devices, and an aWl-bar and 'awl, combined with a stitchsetting-np device consisting of a sliding bar I) and attached point b, and a spring, to operate substantially as described.

The combination, with a longitudinal grooved awl-bar and spring, of a stitch-setting-up device consisting of a bar I) and point I), and a collar or projection .L, to operate substantially as described.

In testimony whereof I name to this specification in the two subscribing Witnesses.

\VINFIELD S. COBB.

have signed my presence of itnesses:

GEO. W. GREGORY, B. DEWAR. 

